Rotary table bushing



Jan. 17, 1939. G. D. .loHNsoNrv 2,144,156

ROTARY TABLE BUSHING Filed Deo. 1o, 1937 @ff f5 N 4f 2 3 40 w 32 f 23 Jj532m 3o y 35 f6' gg f6 ze T f fl-n 10 36 2 /5/ l 4" /VMJ 30 Vm 33 30 3/32s 23 35 /3 5&3 Afm/y I Patched Jan- 17, 193,9;

l I noTaaY'TAnLEnUsmNG' "1 GlennD; Johnson, ompton, Calif., 4ausignortoBoss' Tool Company, Los Angeles, Cami, acorporationof` Californiay e f 1e lf Anplicauoufneeinber 1o, 1931, serielle. 1792131( lV -111` cm Siwaas-23- I l This inventionrelategto wendmg 11i-p mentand ,relates more`particularly to aKel1y..-

I bushing or drive bushing for the rotary table of` a I well drillingrlg.1 A; general object of thistlnven-lwf I 51 tion is to provide animproved;` Simplied andV i readily serviced Idrivebushing, of the rollertype.

transmit rotation thereto. II i In mounting the rollers it has been theusual practice to fix therollers.. on .pins and rotatably support. theIplnsI in.. open-1` `ings in the cages. I`Aiter-atperiod of use the pinsl 5 wear the openings out ofIIrounjd Iandinorder to .3 reconditlon thebushing for further use it isneces I sary'to discard the cages ,asWellgasIItlre.,worn,I`

rollers andfpins` and install new; orrepl'acement cageshavingnewplnsandrollers. I

" 20I` Another. object `of `this invention provideV a Idrivebushing ofthe character mentioned in which the` cages receive llttleorI no Wearand therefore Ido not require replacement. l I

I AnotherobjectA of thisinvention is Itoprovide aI r `zfdrivebushing'of, the roller typevin which theI rollers are rotatableon supportingpins andthe pinsare neldagalnst axialmovementand rota-` I tionso they donot ywear the cages,

for` lubricating the rollers Aand their supporting pins. f

*accompanyingdrawing,'in'which: 2 I f Fig.` 1` is a side elevationof theim gageirrent with aIclrill'steniand seated in a'rotary tablegthe'rotary tablebeing shown inI` vertical w dicated by. nner-4 on` F1g.'3illustrating the l measure-f i `ing providedbythisinventionIshowing'itIin enI`` cross section."` Fig. 2 is an enlargedvertica l.de e 45 "tailed sectional view of thebushing removed irornIItended for on .therotary table ofI-arotary well drilling. rigItoItransrnit rotation Ito the` polygonal Kelly or drill `steniofI thedrilling string. In` the drawingl have illustrated a typical pre- I 5 A.I `ferrecl forrnIIof, theinvention and inFlg; 1 I have A`` type of.-drive bushing Inowl in extenslve use` q includes a shelllorIbody,rau`plurality of cages re- `jIrnovably arrangedin thebody androllers'm` theI mi cagesfor contacting tneIpOIIYUOnaldrill stem to shownthe ,bushing arranged in arotary table T 1toIcoo`perate with a tubularexternally polygonal r l driilstem S., `Theportion of the typical rotarytablelnustatedm Fig. `1 is provldedyitn a cenm verticalopeningI I2. -Theupper portion I2lof the opening` I2 is polygonal while the majorVportion I i ofttlie opening IZi's round in cross sectlonand l5 tapered.It lato be understood thatthe rotary table ITIis adapted to be driven or4rotated in the usual;V manner.I and that the drilling string and thedrillingl tools are adaptedv toIbe passed through the opening I2 in themaster bushing |I. 20 l The Kelly or drill stemISshown in the drawing isof conventional or typical oonstructionand isI an elongate meinberlofsubstantiallyesquare horizontal cross`section.` I

venti'on includes, generally, a body Iladaptedto 'l beseated intheopening I2 ofI Ithe master bush-1 l I 3 r ing Il, Ia. plurality ofIIcages'rliin thebody Il, I Another object of this invention is toprovidea I `30 driveIbushingof the characterereferredyto emrv bodyingIsimple, Ieilectlve and 'inexpensive Iineens y supporting the rollers I6on Ithe cages I5. r 30 I I` "e bushing body Il is provided toIcarry or"containthe cages I5Iand is intended to bearrangedfin theopening I2 ofthebushing II to I rotate withtlie rotary table'l?. The body Il islaplurallti'eslof rollers `I6 and means I1 for rotatably I v Htubularlsftructureelor member having a 4central 354 l longitudinal I opening I8.The .lower portion of I the'bodyIIIl 'is roundIIinIhorizontal crosssection l. I and'is tapered to iitor seatyin thetaperedmajorportlonoffthe master bushing opening l2. The

main or upper'portion of the'body Itis substan- 40 tially square lnIhorizontal cross section to llt l u I tneupper portion Ivonne opening?l2.4 J The l openingffl inthe bodylltpassesIorIreceivesItlre i I `drill"stexnIS'Iwith substantialmclearance"and is I preferably *s ubstanuauysquare m horizontal .45

e r cross Iseotlori to receive ther-,ages I5. A trans-I l tailedseotionalview taken as indicatedv by 'line r r r 3--3 onFlg. 42f, Fig.I4is Iafragmentary verticall'II .wallfof theopening I8 adjacentthelowerlendIof detailed sectionalfyiew taken substantially asin; Il

verse or horlzontalilange l9f,proje`cts from the theoperiing. I'I'he"flange`` I9 Iserves to support f the cageslsin the body Mas 'wiilf'esubsequent- .501 y ly' described.. The extreme upper end portion Ill IThecagesII I5 are removablyarrangedtin the body It to bam the muere Is.where the man ,5

The Idrive bushing providedvby the presentin- 5` 45 orfeedingof thedrillstem. rThere rsides 23. The lower ends 2| of the cages I5 rest on theflange i3 to support the cages in the body |4 and the outer surfaces ofthe cages are adapted to bear outwardly against the :vertical walls ofthe square body opening I3. The opposing inner` surfaces 22 of the sides2Ii are preferably fiat and vertical. The opening I3 of the body I4 isprovided with diagonal 'comer walls `23 cooperating with the outercorners. of the cages I to mist in retaining the cages in `properposition in the body. The inner corner portions of the cages Ilcooperate or mesh to assist in holding iengaging rollers Ilare tubular,being provided l'ni t l: to have' their opposite the cages in properposition as will be more fully described. 'I'he cages i5 arrangedagainst the four side walls of the opening |3 denne a vertical .openingvof square horizontal'cross section adapted to possv the drill stem Swithclearance.

VMeans is provided onthe body 4 to removably retain or hold the cages Ilagainst'vertical move# ment or Vdisplacement.` This means includes aretaining ring 24 threaded on thecylindricai upper portion; |4- of thebody |4. The ring 24 is providedwith an annular inwardly projectingflange 2B that partially overhangs the upper end .of the body openingI3. The flange 25 is adapted' to cooperate with the upper surfaces ofthe cages I3 tb hold the cages down against' the flange i3. Theretaining ring 24 is preferably locked in a position wherelt holds thecages against vertical movement.v Ears 26- project from the exterior ofbody |4 and similar ears 21 are provided on the ring 24." Bolts 2l arearranged thrown openingsvin theears 26 and 21 to deflnitely preventrotation and loening of the ring The rollers Il are rotatably'mounted onthe cages Il by the means|1"and are'provided to cooperate with the drillstem S to transmit turn` ing forces thereto and to permit verticalshifting n n is preferably a plurality of rollersj` i3 foreach kcage I5and the several rollers I3 are preferably identical. rollers I3 arecylindricalmembers and are preferahly hardened to belong wearing. Thestem with central `longitudinal openings 23. VThe oppostte ends of therollers I6 are preferably nat and normsi tothe `longitudinal axes of therollers.

The means |1 serve to rotatably support the rollers Il .in the cages i3for rotation about substantially horizontal axes." The "ineans I'1 areimportant features of the invention as they serve to `support therollers I3V in such a manner that" they do notwe'ar the cagesii. `Themeans I1 completely' through the sides 23 'of the cages and are of equaldiameter. means |1 further include pins 3| seated or arranged in theopenings 3l `and passingv through rollers Il to rotatably support therollers. rollers i3 are positioned betweenthe spaced sides of the cages,Il and end portions supported in the openings 3l and to extend'throughthe openings Y"of the rollers to support the .rollers for rotation aboutsubstantially horizontal axes. The pairs of aligned pinclrrying openingsof the The.

theopenings n in the T'he thepins 39 are arranged` several cages may bein the same horizontal planes so that the rollers I3 arein'corresponding positions on the cages. The parts are related andproportioned so that the rollers I6 rotatably supported on the pins 3|as just described, project inwardly beyond the inner surfaces of thecages |5 to contact the flat side surfaces of the polygonal drill stemS. The pins 3| are preferably solid members of uniform diameter.

The means I1 further includes a novel and very effective arrangement ofparts for holding the pins 3| against rotation and axial movement 'sothat the pins do not wear the openings 30 in thel cages-I5. One ende32of each pin 3| is flat and flush with the `other side surface of oneside 2I|,of its respective cage l5. The said fiat ends 32 of the pins 30are flush with corresponding outer 'side faces of the cage sides 23. Oneside 20 of each cage I5 has a vertically extending recess or notch 33 inits inner corner portions. The notches 33 have fiat vertical walls andare shaped and proportioned to receive the inner comer portions ofadjacentrcages I5. AThe notches 33 partially intersect or join the pinreceiving openings 30. Each pin 3| is provided with a flat walled notch34- in the end portion opposite to the plain flat end 32.- The walls ofthe notches 34 are adapted to lie flush with the walls of the notches 33in thel cage sides 20.-- The parts are related and proportioned so thatthe plain ends 32 of the pins 3| are flush with the adjacent outer sidesurfaces of the sides 2I| when the walls of the notches 34 are flushwith the walls of the notches 33 in the opposite cage sides 23. Theplain or unnotched inner comer' portions of the cages I 5 cooperate withthe notches 33 of adjacent cages I5 to interlock the cages in the properpositions and cooperate with the notches 34 in the pins 3| in saidadjacent cages l5 to positively prevent;

rotation of the pins'and endwise movement'of the pins in one direction.'I'he plain ends 32 of the, pins 3| cooperate with or engage the axialwalls of the notches 34 in the pins 3| carried by adjacent' cages i5 toasist in preventing rotation of the last namedl pins and to preventaxial movement ofy the first named pins in the other direc tion. Thus itwill be seen that ythe transverse walls of the notches 34vcooperate'with the inner surfaces of the sides ofthe adjacent cages I5to prevent axial movement of the pins 3| `in one direction while theplain ends 32 of the pins cooperate with the axial walls of the notches34 in the pins carried by adjacent cages I5 to prevent axial movement ofthe pins in the other direction and the inner corner portions ofadjacent cages I5 have side surfaces cooperating with the axial walls ofthe notches 34 in the pins to positively prevent rotation of the pins.The meshing parts of the cages Il and the pins 3| serve to positivelyhold the pins against movement so vthatvthey canot wear the openings 33.

Means are providedt lubricate the pins"3|l and thev rollers I6. Each pin3| is provided'with an axial lubricant duct 35 and lateral ducts38communicate with the duct 35 and discharge into a vroller opening 23.y'I'he longitudinal ducts 35 may extend inwardly from theplain ends 32 ofthe pins 3l Vand their outer parts may be closed by plugs 31. Verticalor transverse ports 33 arey provided in the pins 3| to communicate withthe* axial ducts 33. A substantially vertical lu bricant port 33 extendsdownwardly through one side 23 of each age i5 to register with the ports33`in the several pins 3| carried by the cage. Grease gun nttings 4I areprovided in g5 i the upper ends of the ports 39 to facilitate the@delivery of lubricant to the ,'I'hetglttingsv III vmay be `contained`in jsocketsi in the,upperl Surfaces ofthe cage; sides'. 2|).`.,The,".n0tclies' 341 in thefpinsfl cooperatingrwith the corner ,Dlftions offthefadjacentcages 4I5, maintain fthe pins in vthe rotativepositions where their ports v *38`ja`re in registrationwith vthe mainlubricant "thepinsandtherollers. V During `the, operation ofthedrilling` apparatus the rotary table` '1" `rotated in, the `usl'ia'imannen` fthe rollers"\|,6 contact the sides oi' the polygonal stem S `totransmitthe `turning forces thereto.

` f ports 39"..V It miipeapparent new lubricant under pressureintroduced through the fittingsjli passes i tothe,openingshlain,therolleijs Iftolubricate andf as the drive btishing`rotatesy AWltlrthey table The rollersVIG are supported-for'freerotationon their pins 3| rso thatfthedrill stem S maybe fed t downwardly ormoved. longitudinally with a miniof friction while being rotated. Therollers `|6 supported onthepins 3|"as describedvabove f rotate abouthorizontal axes `and are',4 of" suiii# 3, cient` length to haveAextensiveengagement with `the atsides Voithepolygonalstem S. 'Ihe sur-`faces 22 are engageable bythe rollers I6 to pre-jl vent endwisemovement of the rollers. The pins f 1 3| are positively heldvagainstturning, by the end openings 30 in the cages, the cages are subjected.to little" or no wear `and last indeilnitely.

When the rollers I6 or the pins `3| or both becomeworn the ring 2l maybe removed from `portions of the adjacent cages I5 and the 'pins 3|cooperating with the notches, andthe pins l'v are definitely heldagainst endwis'e movement by such cooperation.

rollers I6 through their engagement with the drill stem S cannot producemovement -of the. pins 3| and the pins do not wear in the openings 30.As, the cages I5 are not engaged by the ,i drill Accordingly, rotationof the stem S and as the pins 3| do not wear the the body; I4 and-'thecages I5 may be removed further use.

from4 the body for the purpose ofreplacing the pins and rollers.` Whenthe cages i5 are removed from the body Il the worn pins 3| may bereadilydriven or slid from their openings 29 and 30. The newVor replacementpins 3| and rollers I6 may be easily and quickly mounted in the cages I5and the cages provided with the replacement parts may be re-inserted inthe body I4 for The bushing of the present invention is such that it maybe fully reconditioned for use by merely replacing the simpleinexpensive t rollers I6 and pins 3|.

Having described only a typical preferred form and application Vof myinvention, I do notI wish to be limited or restricted to the specificdetails herein set forth, but wish to reserve to myself l any variationsor modications that may appear to those skilled in the Vart or fallwithinthe scope of the following claims: Y

Having described my invention, I claim: 1. A drive bushing ofthecharacter described including a body, cages in the body havingopenings, pins carried in the openings, rollers rotatable on the pins,and surfaces on one cage holding the pins of another cage againstrotation.

2. A drive bushing of the character described including a body, cages inthe body having openings, pins carried in the openings, rollersrotatable on `the pins, and cooperating surfaces on the pins of a givencage and on theadjacent cages preventing rotation of the pins.v

3. A bushing for driving a drill stem of `a drilling string comprising abody,`cages in the body l 6. A bushing for driving a drill stem havingopenings, pins in the openings having flat axially extending faces,rollers "rotatable on the pinsfior'engalging'` with `the drill stein,`and means formholding the'` pins `'against rotation including a cagepart cooperating witiijfsaid-` facebof a pin t 5 on. another cage.4 A 3f4; A bushingnfor driviiigafdrill stem `^oi a drilling` stringcomprisinga"body,cages in the body` having` openings,` pins in the`openings having notches, rollers rotatable on the 'pins` and adapted10- to `engage the drill stem, `and means for holding the pinsjagainstkirotation including surfacesbi a cage"extendingyintothevsaidnotch in the pin on another cage.`

5, A bushing'fqurivirig a riii stem cramm- 15 irig string comprising .ajbody,`V` cages lin the i `having openings, each-cage having al notchjin a comer Jmmg its* opening, the" cjges `being as; sembled with acorner portion of; one cage fitting the `said notch 4in an Vadiacentpage, pins ar- 20'` ranged in said openings lhaving notches registeringwith the first named notches to `cooperate with the said cornerportions, androliers rotatable on the pins.

ing string comprising a body, cages in the body having openings, eachcage having `a notch in `one corner, the cages being assembled about the`drillstern with a cornerportionof one cage received inthe notch of anadjacent cage, a pin 30 )arranged in each opening andhaving anotch lengagedby a fsaid corner portion" of a cage to be l held againstrotation thereby,randfrollersl rotata- `ble on the pin to cooperate withthe" drill stem 7. A bushing fordriving adrill stemof a drill` 3Uingstring comprisingfa body,cages in the body of a drill- 25 havingopenings, each cage having 'a -notch in one corner, the cages beingassembled about the drill stem with a corner portion Vof one cagereceived in the notch or an adjacent ca'ge, a pin arranged in eachopening and having one endengaged by a said corner portion of a cage tobeheld against rotation and axial movement inl one direction and havingits other endV engaged by apin on another cage to be held against axialmovement ;in` the other direction, `and rollers rotatable on the pinsand adapted to cooperate with the drill stem.`

8. A` driveb'ushing forfrota'tmg a drin stem comprising, abodyhavinganopenin'g, a pluralr ity of supporting` members arranged in theopening to define a polygonal opening for receiving the f stem, eachmember having a` vertical notch in one corner receiving ythe cornerportion; of an adjacent member, the membershaving spaced openings ingsand having notches registering with the rst mentioned notchesto be heldagainst rotation by` the corner portions of 1 the members receivedtherein, and rollers rotatable onthe pins toco operate with the stem.` li 9. A drive bushing for rotating a drillstem comprising, a body havingan opening, a plurality o! supporting members arranged in the opening ito denne a` polygonal opening for receiving the stem, each member!Yhaving a'vertical notch in one corner receiving the corner portion ofan` adjacent member, the members having spaced openings joining saidnotches, 1311.15 arranged in the rst mentioned notches to be'heldagainst rotation and axial movement in one direction by the cornerportions of the members received 1 therein, the pin'sof adjacent memberscooperat- `joining `said notches, pins arrangedin the openthe openingsand having notches registering with )m lng to prevent axial movement ofthe pins in the n other .rnd rollers rotntdble'ion the pins.

n lll.y A bushin iordriving l drill `stern ofa drillingltrin'zcomprising s cues in the body havin! openixl. elcheue hnvinl'a notchin scorner iolning itsppenins. the cues bein: s-'- sembledwiths `zomer`portion ot one me fitting the cues :lubricant plunges, n.ndithe pinslmmm lubneent incumbencia 'with the -m;.

n 11; A drivelmnlxinl` torrentim vs'dx'illi stem i bOdlhlvlni-inOpenins.' "vlumlitz of] mordu: umher. Unused in the opening toddine...Polytonpl tot receiving the manu stem, elch member havingl a rticninotch in one corner receiving the corner portion ot an eddscent vmemberthe members having spaced openings 'Joining said notches, pins nrrangedin the openins and having notches relisterinz with the lfirst mentionednotches to be held against rotationv nnjd' axial movement in onedirection by the corner portions of the members received therein, thepins' o1 ndincent members cooperating to 'prevent axial `movement of thepins in the other direction. and rollers rotatable' on the pins,themembers having' lubricant passages in tersectinazV said openings, undthe pins having lulzvricnntA ducts withthe said passages.

GLENN n. JOHNSON.

